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#include <bits/stdc++.h>

using namespace std;

int main() {
    ios::sync_with_stdio(false); cin.tie(nullptr);

    int a, b, c; cin >> a >> b >> c;

    int64_t ans = 0;

    int basemod = 10;
    for (int i = 0; i < 6; ++i) {
        if (c%basemod == c) break;
        basemod *= 10;
    }

    while (c != 0) {
        int mod = basemod;
        while (mod > 1) {
            if ((c%mod)-(a%mod)-(b%mod) == 0) ++ans;
            mod /= 10;
        }

        basemod /= 10;
        a /= 10;
        b /= 10;
        c /= 10;
    }

    cout << ans << "\n";

    return 0;
}